Police received a report around 2.50 am that the premises in the Main Street area of Donaghcloney had been broken into.
It is not known at this stage if anything has been stolen.
Detectives are keen to hear from anyone who was in the area and who may have witnessed any suspicious activity.
Anyone with information should contact the new non-emergency number 101.
Or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.